| Gwladus | Woman | Welsh Names |
| Gwydion | Man | Welsh Names |
| Gwylan | Woman | Welsh Names |
| Gwyn | Man | Welsh Names |
| Gwyneira | Woman | Welsh Names |
| Gwyneth | Woman | Welsh Names |
| Haf | Woman | Welsh Names |
| Hafwen | Woman | Welsh Names |
| Hedd | Man | Welsh Names |
| Heddwyn | Man | Welsh Names |
| Heulwen | Woman | Welsh Names |
| Howell | Man | Welsh Names |
| Hywel | Man | Welsh Names |
| Ianto | Man | Welsh Names |
| Idwal | Man | Welsh Names |
| Ieuan | Man | Welsh Names |
| Ifan | Man | Welsh Names |
| Ifor | Man | Welsh Names |
| Igraine | Woman | Welsh Names |
| Ilar | Unisex | Welsh Names |